<template>
    <div class="tags-view-container">
        <scroll-pane class="tags-view-wrapper" ref="scrollPane">
            <router-link
                ref="tag"
                :class="isActive(tag)?'active':''"
                :to="tag"
                @contextmenu.prevent.native="openMenu(tag,$event)"
                v-for="(tag,index) in Array.from(visitedViews)"
                :key="tag.path"
            >
                {{tag.name}}
                <span
                    class="el-icon-close"
                    @click.prevent.stop="closeSelectedTag(tag,index)"
                ></span>
            </router-link>
        </scroll-pane>
        <ul class="contextmenu" v-show="visible" :style="{left:left+'px',top:top+'px'}">
            <li @click="closeSelectedTag(selectedTag)">关闭</li>
            <li @click="closeOthersTags">关闭其他</li>
            <li @click="closeAllTags">关闭所有</li>
        </ul>
    </div>
</template>

<script>
import ScrollPane from "@/components/ScrollPane";
export default {
    name: "tagsview",
    components: { ScrollPane },
    data() {
        return {
            visible: false,
            top: 0,
            left: 0,
            selectedTag: {}
        };
    },
    computed: {
        visitedViews() {
            //
            //
            //
            return this.$store.state.tagsview.visitedViews;
        }
    },
    watch: {
        $route() {
            this.addViewTags();
            this.moveToCurrentTag();
        },
        visible(value) {
            if (value) {
                document.body.addEventListener("click", this.closeMenu);
            } else {
                document.body.removeEventListener("click", this.closeMenu);
            }
        }
    },
    mounted() {
        this.addViewTags();
    },
    methods: {
        generateRoute() {
            if (this.$route.name) {
                return this.$route;
            }
            return false;
        },
        isActive(route) {
            return route.fullPath === this.$route.fullPath;
        },
        addViewTags() {
            const route = this.generateRoute();
            if (!route) {
                return false;
            }
            this.$store.dispatch("addVisitedViews", route);
        },
        moveToCurrentTag() {
            const tags = this.$refs.tag;
            this.$nextTick(() => {
                for (const tag of tags) {
                    if (tag.to.path === this.$route.path) {
                        this.$refs.scrollPane.moveToTarget(tag.$el);
                        break;
                    }
                }
            });
        },
        closeSelectedTag(view, index) {
            this.$store.dispatch("delVisitedViews", view).then(views => {
                if (this.isActive(view)) {
                    const latestView = views.slice(-1)[0];

                    if (latestView) {
                        this.$router.push(latestView);
                    } else {
                        this.$router.push("/");
                    }
                }
            });
        },
        closeOthersTags() {
            this.$router.push(this.selectedTag);
            this.$store
                .dispatch("delOthersViews", this.selectedTag)
                .then(() => {
                    this.moveToCurrentTag();
                });
        },
        closeAllTags() {
            this.$store.dispatch("delAllViews");
            this.$router.push("/");
        },
        openMenu(tag, e) {
            this.visible = true;
            this.selectedTag = tag;
            const offsetLeft = this.$el.getBoundingClientRect().left; // container margin left
            this.left = e.clientX - offsetLeft + 15; // 15: margin right
            this.top = e.clientY - 40;
        },
        closeMenu() {
            this.visible = false;
        }
    }
};
</script>

<style  lang="scss" scoped>
.tags-view-container {
    .tags-view-wrapper {
        background: #fff;
        height: 34px;
        border-bottom: 1px solid #d8dce5;
        box-shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.12),
            0 0 3px 0 rgba(0, 0, 0, 0.04);
        .scroll-wrapper a {
            display: inline-block;
            position: relative;
            height: 26px;
            line-height: 26px;
            border: 1px solid #d8dce5;
            color: #495060;
            background: #fff;
            padding: 0 8px;
            font-size: 12px;
            margin-left: 5px;
            margin-top: 4px;
            text-decoration: none;
            &:first-of-type {
                margin-left: 15px;
            }
            &.active {
                background-color: #42b983;
                color: #fff;
                border-color: #42b983;
                &::before {
                    content: "";
                    background: #fff;
                    display: inline-block;
                    width: 8px;
                    height: 8px;
                    border-radius: 50%;
                    position: relative;
                    margin-right: 2px;
                }
            }
        }
    }
    .contextmenu {
        margin: 0;
        background: #fff;
        z-index: 100;
        position: absolute;
        list-style-type: none;
        padding: 5px 0;
        border-radius: 4px;
        font-size: 12px;
        font-weight: 400;
        color: #333;
        box-shadow: 2px 2px 3px 0 rgba(0, 0, 0, 0.3);
        li {
            margin: 0;
            padding: 7px 16px;
            cursor: pointer;
            &:hover {
                background: #eee;
            }
        }
    }
}
</style>

<style  lang="scss">
//reset element css of el-icon-close
.tags-view-wrapper {
    .tags-view-item {
        .el-icon-close {
            width: 16px;
            height: 16px;
            vertical-align: 2px;
            border-radius: 50%;
            text-align: center;
            transition: all 0.3s cubic-bezier(0.645, 0.045, 0.355, 1);
            transform-origin: 100% 50%;
            &:before {
                transform: scale(0.6);
                display: inline-block;
                vertical-align: -3px;
            }
            &:hover {
                background-color: #b4bccc;
                color: #fff;
            }
        }
    }
}
</style>